Fig. 10.

55-year-old male presented with a posterior fossa hemorrhage for which decompression was performed. After surgery DECTA and DECTV were made in search of underlying pathology. Shown are CTA: mixed images with H31 kernel (a), mixed images with H20 kernel (b), VNC (c), IOM (d), fusion images (e) and manually segmented VR from IOM (f, l). The lower series shows DECTV: mixed images H31 kernel (g), mixed images H20 kernel (h), VNC (i), IOM (j), fusion images (k). A residual hematoma is found in the posterior fossa. A developmental venous anomaly (DVA) is shown, best depicted on IOM and fusion images in the arterial phase. VR images from iodine images clearly demonstrate the DVA (arrow). This was not visible when VR was done from mixed source images of DECTA/DECTV (not shown) (DECTA 80/Sn140 kVp, 310/155 mAs, CTDI 26.34 mGy, DLP 575 mGycm DECTV 80/Sn140 kVp, 310/155 mAs, CTDI 26.34 mGy, DLP 576 mGycm; 95 cc iodinated contrast 300 mg/ml; injection rate 5 cc/s; 40 cc saline flush 5 cc/s)